CN107358225B - Fingerprint module - Google Patents
Fingerprint module Download PDFInfo
- Publication number
- CN107358225B CN107358225B CN201710792150.4A CN201710792150A CN107358225B CN 107358225 B CN107358225 B CN 107358225B CN 201710792150 A CN201710792150 A CN 201710792150A CN 107358225 B CN107358225 B CN 107358225B
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- fingerprint
- antenna
- sensing unit
- package substrate
- circuit board
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- 239000000758 substrate Substances 0.000 claims description 30
- 239000004020 conductor Substances 0.000 claims description 26
- 238000001514 detection method Methods 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000002955 isolation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 239000003989 dielectric material Substances 0.000 description 5
- 239000005022 packaging material Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
Landscapes
- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Image Input (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
A fingerprint module comprises a fingerprint sensing unit, wherein the surface of the fingerprint sensing unit comprises a fingerprint image sensing area and a non-fingerprint image sensing area; a fingerprint sensor grain is arranged below the fingerprint image sensing area; an electromagnetic window is arranged below the non-fingerprint image sensing area, an antenna is arranged below the electromagnetic window, and the electromagnetic window is a space from the surface of the fingerprint sensing unit to the surface of the antenna, through which electromagnetic signals can penetrate. The invention adopts the isolation method to improve the ESD capacity of the fingerprint module, and compared with the discharging method, the invention saves cost and simplifies the structure.
Description
Technical Field
The invention relates to the field of fingerprint identification, in particular to a fingerprint module for fingerprint detection and identification.
Background
In order to receive external signals, an antenna, such as an antenna for detecting finger touch signals, an antenna for receiving transmission frequency signals, etc., is usually disposed in the fingerprint module.
Taking an antenna for detecting a finger touch signal as an example, the following outlines the technical problem of setting an antenna in a fingerprint module in the field: the fingerprint module can achieve the effect of unlocking when being opened by one touch by taking the fingerprint module as a trigger switch, and is widely applied to the field of smart phones. In order to reduce the finger detection power consumption to meet the severe requirement of the dry battery power supply system on standby power consumption, a method for detecting the finger by using fingerprint image acquisition per se in the field of smart phones cannot be adopted. The scheme of the power consumption feasibility is that an independent capacitive touch detection circuit is used, touch detection electrodes are arranged on the periphery of a fingerprint sensing area, and when a finger touch is detected, a fingerprint sensor is started to collect fingerprints. A common method for setting a touch detection electrode in the art is to set a metal ring on the periphery of a fingerprint chip, as shown in fig. 1, where a metal ring 500 is set on the periphery of the fingerprint chip and exposed.
For bare antennas similar to the metal rings, the ESD design can only use TVS and other discharging circuits, and the structure is complex and requires high cost to meet the requirements.
Disclosure of Invention
In order to solve the technical problems in the background technology, the invention provides the following technical scheme: a fingerprint module comprises a fingerprint sensing unit, wherein the surface of the fingerprint sensing unit comprises a fingerprint image sensing area and a non-fingerprint image sensing area; the fingerprint sensor crystal grain is arranged below the fingerprint image sensing area; the electromagnetic window is arranged below the non-fingerprint image sensing area, an antenna is arranged below the electromagnetic window, and the electromagnetic window is a space from the surface of the fingerprint sensing unit to the surface of the antenna, through which electromagnetic signals can penetrate.
Preferably, the antenna is a touch detection electrode or a radio frequency transceiver antenna.
Preferably, the space does not contain an electromagnetic shielding material.
Preferably, the space does not contain a conductor material.
Preferably, the fingerprint sensing unit is arranged above the circuit board, and the antenna is formed on the upper surface, the middle layer or the lower surface of the circuit board.
Preferably, the fingerprint sensing unit comprises a packaging substrate, wherein the packaging substrate is not provided with a conductor at the position of the electromagnetic window, the antenna is arranged on the middle layer or the lower surface of the circuit board, and the circuit board is not provided with a conductor at the position of the electromagnetic window.
Preferably, the fingerprint sensing device further comprises a circuit board, and the antenna is a conductor pad arranged between the fingerprint sensing unit and the circuit board.
Preferably, the fingerprint sensing unit comprises a package substrate, which is not provided with conductors at the location of the electromagnetic window.
Preferably, the fingerprint sensing unit comprises a package substrate, the fingerprint sensor die is disposed on the package substrate, and the antenna is formed on an upper surface, an intermediate layer or a lower surface of the package substrate.
Preferably, the antenna is formed on an intermediate layer or a lower surface of the package substrate, and the package substrate does not include a conductor at a position of the electromagnetic window.
Preferably, the antenna is electrically connected to a touch detection circuit or a radio frequency circuit.
The invention uses the packaging material of the fingerprint sensor unit to isolate the antenna, the isolation method ensures that the fingerprint module has good ESD capacity, and the cost is saved and the structure is simplified because a bleeder circuit is not used. An electromagnetic window is opened for the antenna in the fingerprint module, and the antenna is placed below the electromagnetic window, so that signal receiving and transmitting or finger detection can be realized through a dielectric material, and electrostatic discharge is isolated by the dielectric material.
In addition, for the electronic equipment with the fingerprint unlocking and starting functions and the wireless unlocking and starting functions, the antenna is usually arranged on the periphery of the fingerprint sensor unit, and the radio frequency antenna is arranged below the fingerprint sensor unit, so that the space is saved.
Drawings
Fig. 1 is a schematic diagram of a fingerprint module of the prior art.
Fig. 2A-1, fig. 2A-2, and fig. 2A-3 are schematic diagrams illustrating three embodiments of antenna positions of a fingerprint module according to a first embodiment of the present invention.
Fig. 2B is a bottom view of the fingerprint module according to the first embodiment of the invention.
Fig. 2C-1, fig. 2C-2 are two implementation manners of the antenna shape of the fingerprint module according to the first embodiment of the present invention.
Fig. 3-1, fig. 3-2, and fig. 3-3 are schematic diagrams illustrating three embodiments of antenna positions of a fingerprint module according to a second embodiment of the invention.
Fig. 4 is a schematic diagram of a fingerprint module according to a third embodiment of the present invention.
Fig. 5 is a working flow of the fingerprint module of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The upper direction in the invention is the direction in which the finger contacts the fingerprint module.
The invention provides a fingerprint module, which is characterized by comprising a fingerprint sensing unit, wherein the surface of the fingerprint sensing unit comprises a fingerprint image sensing area and a non-fingerprint image sensing area; the fingerprint sensor crystal grain is arranged below the fingerprint image sensing area; the electromagnetic window is arranged below the non-fingerprint image sensing area, an antenna is arranged below the electromagnetic window, and the electromagnetic window is a space from the surface of the fingerprint sensing unit to the surface of the antenna, through which electromagnetic signals can penetrate. The antenna is a touch detection electrode or a radio frequency transceiver antenna.
The fingerprint image sensing area is a circuit for sensing a fingerprint image below the area and can sense the fingerprint image of a finger placed in the area; the non-fingerprint image sensing area refers to a circuit below the area that does not sense a fingerprint image, and is not capable of sensing a fingerprint image of a finger placed in the area.
The fingerprint sensor die is a component including a fingerprint sensor circuit for sensing a fingerprint pattern.
The invention is not limited to the application of the radio frequency receiving and transmitting antenna, and can be used for being parallel to a fingerprint module, starting electronic equipment, controlling the fingerprint module and the like.
First embodiment
As shown in fig. 2A, the fingerprint module 100 includes a fingerprint sensing unit 10, a circuit board 13, and an antenna 15, wherein the fingerprint sensing unit 10 is disposed on the circuit board 13 and electrically connected thereto, preferably via pads 14, but also via other means such as solder balls. In this embodiment, the surface of the fingerprint sensing unit 10 includes a fingerprint image sensing area and a non-fingerprint image sensing area, the fingerprint sensor die 12 is disposed below the fingerprint image sensing area, and is disposed on the package substrate 110 and is covered by the packaging material 111, as known in the art, the packaging material 111 is a dielectric material, and the package substrate 110 is provided with a conductor; an electromagnetic window 113 is arranged below the non-fingerprint image sensing area, an antenna 15 is arranged below the electromagnetic window 113, the electromagnetic window 113 is a space from the surface of the fingerprint sensing unit to the surface of the antenna, through which electromagnetic signals can penetrate, and passes through the packaging material 111 at the periphery of the fingerprint sensor die 12, and in all the drawings, the electromagnetic window is represented by an ellipse with a broken line, which only represents the space above the antenna where the electromagnetic window exists, and does not accurately represent the size and shape of the electromagnetic window. In order to make the space penetrable by electromagnetic signals, the space does not contain electromagnetic shielding material, preferably the space does not contain conductors.
To form the above electromagnetic window, as shown in fig. 2A, the parts including the electromagnetic shielding material such as the conductor or the conductor wiring and the like are all kept away from the position of the electromagnetic window, and for convenience of illustration, the parts including the conductor (such as the fingerprint sensor die 12 and the package substrate 110 including the conductor and the pad 14) are filled with the grid pattern, and the parts including the conductor are all kept away from the position where the electromagnetic window 113, 113' or 113″ is to be formed, specifically as follows: in this embodiment, the antenna is formed on the circuit board 13, which may be formed on any layer on the circuit board 13, for example, fig. 2A-1, the antenna 15 may be formed on the upper surface of the circuit board 13, which is the same layer as the pad layer of the circuit board 13, and in order to form the electromagnetic window, the package substrate 110 is not provided with a conductor at the position of the electromagnetic window 113; the antenna 15 'may be formed in the middle layer of the circuit board as shown in fig. 2A-2, or the antenna 15 "may be formed in the lower surface of the circuit board as shown in fig. 2A-3, for example, when the antenna is formed in the middle layer or the lower surface of the circuit board, the circuit board 13 and the package substrate 110 are not provided with conductors at the positions of the electromagnetic windows 113' or 113" because the electromagnetic windows need to pass through the circuit board and the package substrate. No conductors, such as pads or the like, are provided between the fingerprint sensing unit 10 and the circuit board 13 at the positions of the electromagnetic windows 113, 113' or 113", no matter where the antenna is formed on the circuit board.
In the invention, the packaging substrate 110 and the circuit board 13 are not provided with conductors at the positions of the electromagnetic windows, and under the structure, the antenna signal receiving and transmitting or finger detection can be realized through the dielectric material, and meanwhile, the dielectric material is utilized to isolate electrostatic discharge.
The gap between the fingerprint sensing unit 10 and the circuit board 13 is filled with filling glue, which can further isolate electrostatic discharge, and the periphery of the fingerprint sensing unit 10 is also coated with the filling glue to protect the fingerprint sensing unit.
Fig. 2B is a bottom view of the fingerprint module of the first embodiment, where the fingerprint module includes a control circuit 17 for controlling the fingerprint sensing unit 11 to perform fingerprint detection, and preferably, the control circuit 17 further calculates a fingerprint detection result to perform fingerprint identification; the circuit 116 is a touch detection circuit or a radio frequency transceiver circuit, which is electrically connected to the antenna 15, and when the circuit 116 is a touch detection circuit, it receives a touch signal induced by the antenna 15, and when the circuit 116 is a radio frequency transceiver circuit, it receives a radio frequency signal induced by the antenna 15, or transmits a radio frequency signal through the antenna 15. The voltage stabilizer 117,114 is used for stabilizing the voltages of the control circuit 17 and the circuit 116 respectively; flash112 is used for storing fingerprint information; the pin 115 is used to connect the fingerprint module with other devices, such as a host, to enable communication with the other devices.
The antenna may be in a frame shape, a bar shape, a radiation shape, or the like, and may be in any other shape, such as a ring shape, a polygon shape, or the like, according to the change of the shape of the fingerprint sensing unit, as shown in fig. 2C-1 and fig. 2C-2, which are schematic diagrams of the frame shape and the bar shape, and other shapes are not shown one by one.
Second embodiment
As shown in fig. 3-1 to 3-3, the fingerprint sensing unit is denoted as fingerprint sensing unit 20, unlike the first embodiment in which the antenna is formed on the package substrate 210, the antenna may be formed on any layer of the package substrate. As shown in fig. 3-1 and fig. 3-2, the antenna may be formed on the lower surface or middle layer of the package substrate 210 as 25 or 25', and the package substrate 210 is not provided with a conductor at the position of the electromagnetic window 213 or 213'; as shown in fig. 3-3, the antenna 25 "may also be formed on the upper surface of the package substrate 210. The shape of the components and the like of the back surface of the fingerprint module are the same as those of the first embodiment.
Third embodiment
As shown in fig. 4, the fingerprint sensing unit is marked as fingerprint sensing unit 40, unlike the first embodiment, the antenna 45 is a conductor pad disposed between the fingerprint sensing unit 40 and the circuit board 43, which may be disposed at any height between the fingerprint sensing unit 40 and the circuit board 43. An electromagnetic window 413 is disposed below the non-fingerprint sensing region, and an antenna 45 is disposed below the electromagnetic window 413. The package material 411 is provided with an electromagnetic window, and the package substrate 410 is not provided with a conductor at the position of the electromagnetic window 413. The shape of the components and the like of the back surface of the fingerprint module are the same as those of the first embodiment.
FIG. 5 is a flowchart of the fingerprint module when the antenna of the present invention is a touch detection electrode, and when no object contacts the fingerprint image sensing area, the fingerprint sensor die and the control circuit are both in standby state, and the touch detection circuit is in operation state; when an object contacts the fingerprint image sensing area, the physical quantity (such as capacitance) detected by the touch detection electrode changes, the touch detection circuit senses the detection of the touch detection electrode to generate a touch signal, the touch detection circuit outputs the touch signal to the processor, the processor judges whether fingerprint identification is needed according to the touch signal, and when the processor judges that the fingerprint identification is needed, the control circuit controls the fingerprint sensing unit to conduct fingerprint detection. Because whether the finger touches the fingerprint module is judged first, the power consumption of the fingerprint module can be reduced.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (8)
1. A fingerprint module is characterized by comprising
The fingerprint sensing unit comprises a fingerprint image sensing area and a non-fingerprint image sensing area on the surface of the fingerprint sensing unit;
the fingerprint sensor crystal grain is arranged below the fingerprint image sensing area;
the electromagnetic window is arranged below the non-fingerprint image sensing area, an antenna is arranged below the electromagnetic window, the electromagnetic window is a space from the surface of the non-fingerprint image sensing area to the surface of the antenna, and the space does not contain electromagnetic shielding materials and conductor materials;
the fingerprint sensing unit is arranged above the circuit board, and the antenna is formed on the upper surface, the middle layer or the lower surface of the circuit board.
2. The fingerprint module of claim 1, wherein the antenna is a touch detection electrode or a radio frequency transceiver antenna.
3. The fingerprint module of claim 1, wherein the fingerprint sensing unit comprises a package substrate, the package substrate is not provided with a conductor at the position of the electromagnetic window, the antenna is arranged on the middle layer or the lower surface of the circuit board, and the circuit board is not provided with a conductor at the position of the electromagnetic window.
4. The fingerprint module of claim 1, further comprising a circuit board, wherein the antenna is a conductor pad disposed between the fingerprint sensing unit and the circuit board.
5. The fingerprint module of claim 4, wherein the fingerprint sensing unit comprises a package substrate, the package substrate being free of conductors at the location of the electromagnetic window.
6. The fingerprint module of claim 1, wherein the fingerprint sensing unit comprises a package substrate, the fingerprint sensor die is disposed on the package substrate, and the antenna is formed on an upper surface, an intermediate layer, or a lower surface of the package substrate.
7. The fingerprint module of claim 6, wherein the antenna is on an intermediate or lower surface of the package substrate, the package substrate not including conductors at the location of the electromagnetic window.
8. The fingerprint module of any one of claims 1-7, wherein the antenna is electrically connected to a touch detection circuit or a radio frequency circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710792150.4A CN107358225B (en) | 2017-09-05 | 2017-09-05 | Fingerprint module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710792150.4A CN107358225B (en) | 2017-09-05 | 2017-09-05 | Fingerprint module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107358225A CN107358225A (en) | 2017-11-17 |
| CN107358225B true CN107358225B (en) | 2024-02-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710792150.4A Active CN107358225B (en) | 2017-09-05 | 2017-09-05 | Fingerprint module |
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| Country | Link |
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| CN (1) | CN107358225B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3789912B1 (en) * | 2019-07-04 | 2023-05-17 | Shenzhen Goodix Technology Co., Ltd. | Fingerprint sensor, fingerprint recognition module and fingerprint recognition system |
| CN114745850A (en) * | 2022-04-13 | 2022-07-12 | 业成科技（成都）有限公司 | Fingerprint identification device and manufacturing method of fingerprint identification device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103810479A (en) * | 2014-02-28 | 2014-05-21 | 成都费恩格尔微电子技术有限公司 | Fingerprint collection system and fingerprint information collection method |
| CN105608437A (en) * | 2015-12-25 | 2016-05-25 | 成都费恩格尔微电子技术有限公司 | Hybrid fingerprint acquisition chip and acquisition method |
| CN106716444A (en) * | 2015-04-23 | 2017-05-24 | 深圳市汇顶科技股份有限公司 | Multifunction fingerprint sensor |
| CN106921819A (en) * | 2015-12-28 | 2017-07-04 | 天津智想科技发展有限公司 | A kind of biometric image acquisition system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI536273B (en) * | 2014-08-26 | 2016-06-01 | Gingy Technology Inc | Photoelectric fingerprint identification device |
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2017
- 2017-09-05 CN CN201710792150.4A patent/CN107358225B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103810479A (en) * | 2014-02-28 | 2014-05-21 | 成都费恩格尔微电子技术有限公司 | Fingerprint collection system and fingerprint information collection method |
| CN106716444A (en) * | 2015-04-23 | 2017-05-24 | 深圳市汇顶科技股份有限公司 | Multifunction fingerprint sensor |
| CN105608437A (en) * | 2015-12-25 | 2016-05-25 | 成都费恩格尔微电子技术有限公司 | Hybrid fingerprint acquisition chip and acquisition method |
| CN106921819A (en) * | 2015-12-28 | 2017-07-04 | 天津智想科技发展有限公司 | A kind of biometric image acquisition system |
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| Publication number | Publication date |
|---|---|
| CN107358225A (en) | 2017-11-17 |
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